Thread: i need help with directx

right ive created a window and registered it
now when i create the D3D device and set the Windowed to FALSE;
it dosent set the screen to full , infact when i run the exe nothing happens

Code:

// directxwork.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"
#include <d3d9.h>

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;								// current instance
TCHAR szTitle[MAX_LOADSTRING];								// The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];								// The title bar text
HWND hWnd; //main window handle
MSG msg;
HACCEL hAccelTable;
// Foward declarations of functions included in this code module:


VOID RESTIGER();
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK	About(HWND, UINT, WPARAM, LPARAM);

//link d3d9.lib 
//Directx globals..
IDirect3D9* g_pDirect3D = NULL;
IDirect3DDevice9* g_pDirect3DDevice = NULL;
D3DPRESENT_PARAMETERS D3DPresentParams;

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
 

    //create the window..
    WNDCLASSEX wcex;
    wcex.cbSize = sizeof(WNDCLASSEX); 
    wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= (WNDPROC)WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, (LPCTSTR)IDI_DIRECTXWORK);
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+14);
	wcex.lpszMenuName	= (LPCSTR)IDC_DIRECTXWORK;
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);
    RegisterClassEx(&wcex); //register winddow
	
    hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
	
    hInst = hInstance;

	ShowWindow(hWnd, SW_MAXIMIZE);
    UpdateWindow(hWnd);

   

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_DIRECTXWORK, szWindowClass, MAX_LOADSTRING);


    
	//Directx
	g_pDirect3D = Direct3DCreate9(D3D_SDK_VERSION);
    if(g_pDirect3D == NULL) return E_FAIL;
   
	HRESULT hResult = g_pDirect3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,hWnd,D3DCREATE_SOFTWARE_VERTEXPROCESSING,&D3DPresentParams,&g_pDirect3DDevice);
	if(FAILED(hResult)) return E_FAIL;
    ZeroMemory(&D3DPresentParams, sizeof(D3DPRESENT_PARAMETERS));
	D3DPresentParams.Windowed = FALSE;
    D3DPresentParams.BackBufferCount = 1;
	D3DPresentParams.BackBufferWidth = 800;
	D3DPresentParams.BackBufferHeight = 600;
	D3DPresentParams.BackBufferFormat = D3DFMT_X8R8G8B8;
	D3DPresentParams.SwapEffect = D3DSWAPEFFECT_DISCARD;
    D3DPresentParams.hDeviceWindow = hWnd;
//need to finish this structure..


    hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_DIRECTXWORK);

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0)) 
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
	TCHAR szHello[MAX_LOADSTRING];
	LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

	switch (message) 
	{
		case WM_COMMAND:
			wmId    = LOWORD(wParam); 
			wmEvent = HIWORD(wParam); 
			// Parse the menu selections:
			switch (wmId)
			{
				case IDM_ABOUT:
				   DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
				   break;
				case IDM_EXIT:
				   DestroyWindow(hWnd);
				   break;
				default:
				   return DefWindowProc(hWnd, message, wParam, lParam);
			}
			break;
		case WM_PAINT:
			hdc = BeginPaint(hWnd, &ps);
			// TODO: Add any drawing code here...
			RECT rt;
			GetClientRect(hWnd, &rt);
			DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
			EndPaint(hWnd, &ps);
			break;
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
		case WM_INITDIALOG:
				return TRUE;

		case WM_COMMAND:
			if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) 
			{
				EndDialog(hDlg, LOWORD(wParam));
				return TRUE;
			}
			break;
	}
    return FALSE;
}

the problem is the window just flash's and doesent stay